Most grocery store house brand corn flakes are made by Kellogg's. If you pour a bowl of the store brand and the Kellogg's, you'll notice there is a difference:

Most grocery store house brand corn flakes are made by Kellogg's. If you pour a bowl of the store brand and the Kellogg's, you'll notice there is a difference: the Kellogg's flakes are larger. The store brand box is mostly the corn flakes that met a lower quality standard but are still of acceptable quality. Wouldn't be surprised if this is often the case with other white label or store brands.